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14th July 2020, 05:00 PM #1Most Valued Member
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AL-250G Lathe - Threading Indicator Table
Can anyone out there shed some light on the threading options for this lathe?
The thread chasing dial comes with alternative gears, 32 teeth and 35 teeth. It is clear that for correct registration there are some specific thread pitches that require the gear to be changed.
The indicator table shows which specific pitches are associated with each gear. Simple eh???
Unfortunately the table also shows a dash in the "Z" (gear) column and shown against this is another range of pitches with an infinity symbol in the "Scale" column.
Surely this doesn't mean that if no gear is used it is possible to obtain registration in an infinite number of positions, that would be just plain silly.
So, what does it mean?
There is a photo of this Indicator Table in the group of photos for this lathe on the Hare & Forbes site.
Read the full thread at metalworkforums.com...
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